Small 56.4 KB PDF datasheet for the ST8016, an IC that, by its numbering, seems to be a Sitronix LCD driver. Check the first page to confirm the maker and function, since the name states only the part number. Driver sheets of this sort describe pin functions, supply ranges, logic interface and timing, needed when a segment or line of an LCD is missing and the driver chip or its connections are suspected. Match the marking on the chip or flex with ST8016 before using the pinout.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @acodis_lcd_datasheets_EDID. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.